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Pre–Main-Sequence Evolutionary Tracks

Description
Pre–Main-Sequence Evolutionary Tracks
This H-R diagram shows evolutionary tracks based on models of seven stars having different masses. The dashed lines indicate
the stage reached after the indicated number of years of evolution. The birth line, shown in blue, is the location where each
protostar stops accreting matter and becomes a pre–main-sequence star. Note that all tracks terminate on the main
sequence at points that agree with the mass-luminosity relation
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